Pub Date : 2024-06-15DOI: 10.1007/s13738-024-03058-y
Khursheed Ahmad, Theophile Niyitanga, Aarti Pathak, Rais Ahmad Khan, Mohd Quasim Khan
Herein, we reported the construction of hydrogen peroxide (H2O2) sensor using calcium titanate modified screen printed electrode (CaTiO3@SPE). The CaTiO3 has been synthesized via hydrothermal method using calcium nitrate tetrahydrate and titanium butoxide as the Ca and Ti source. The CaTiO3 was characterized by many physiochemical techniques such as powder X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), Brunauer–Emmett–Teller (BET) and scanning electron microscopy (SEM). The XRD analysis revealed the existence of decent crystalline nature in the synthesized material, while EDX results demonstrated its good phase purity. The SEM micrographs suggested that CaTiO3 has flakes-like surface structure. The BET results also indicated that CaTiO3 has specific surface area of 57.6 m2/g. Furthermore, CaTiO3 was used as the electrode material and CaTiO3@SPE has been constructed using drop-casting method. The fabricated CaTiO3@SPE was used for the sensing of H2O2 using cyclic voltammetry and linear sweep voltammetry methods. The CaTiO3@SPE exhibited reasonable limit of detection of 0.08 µM with good selectivity, stability and repeatability.
{"title":"Fabrication of CaTiO3 modified glassy carbon electrode-based hydrogen peroxide sensor","authors":"Khursheed Ahmad, Theophile Niyitanga, Aarti Pathak, Rais Ahmad Khan, Mohd Quasim Khan","doi":"10.1007/s13738-024-03058-y","DOIUrl":"10.1007/s13738-024-03058-y","url":null,"abstract":"<div><p>Herein, we reported the construction of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) sensor using calcium titanate modified screen printed electrode (CaTiO<sub>3</sub>@SPE). The CaTiO<sub>3</sub> has been synthesized via hydrothermal method using calcium nitrate tetrahydrate and titanium butoxide as the Ca and Ti source. The CaTiO<sub>3</sub> was characterized by many physiochemical techniques such as powder X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), Brunauer–Emmett–Teller (BET) and scanning electron microscopy (SEM). The XRD analysis revealed the existence of decent crystalline nature in the synthesized material, while EDX results demonstrated its good phase purity. The SEM micrographs suggested that CaTiO<sub>3</sub> has flakes-like surface structure. The BET results also indicated that CaTiO<sub>3</sub> has specific surface area of 57.6 m<sup>2</sup>/g. Furthermore, CaTiO<sub>3</sub> was used as the electrode material and CaTiO<sub>3</sub>@SPE has been constructed using drop-casting method. The fabricated CaTiO<sub>3</sub>@SPE was used for the sensing of H<sub>2</sub>O<sub>2</sub> using cyclic voltammetry and linear sweep voltammetry methods. The CaTiO<sub>3</sub>@SPE exhibited reasonable limit of detection of 0.08 µM with good selectivity, stability and repeatability.</p></div>","PeriodicalId":676,"journal":{"name":"Journal of the Iranian Chemical Society","volume":"21 8","pages":"2147 - 2157"},"PeriodicalIF":2.2,"publicationDate":"2024-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141337523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A smartphone-based colorimetric detection method was optimized for measuring the fluoride content in tea extracts using zirconium-xylenol orange reagent. The images of the formed color complex in the presence of fluoride were captured and analyzed their color components through the RGB (Red, Green, Blue) vector values. To maintain the capturing conditions, a colorimetric box (150 × 70 × 90 mm) was self-designed by optimizing the smartphone camera-sample holder/cuvette distance and inside brightness. The calibration curve was constructed from 0.5 to 25 mg/L with the goodness of linearity (R2 > 0.995). Favorable repeatability and reproducibility were obtained (RSDr = 5.01% and RSDR = 5.02%), according to the Appendix F of AOAC (2016). UV–Vis and F ion-selective electrode were simultaneously conducted as reference methods for the developed smartphone-based method, demonstrating comparable fluoride content results in tea extracts obtained from these methods. Using 2.5 g tea brewed in 100 mL of deionized water at 90 °C for 60 min, a descending fluoride content order was achieved: black tea (3.31–3.85 mg/L) > oolong tea (2.38–2.65 mg/L) > green tea (2.25–2.97 mg/L) > white tea (2.28–2.31 mg/L). The smartphone-based method was also applied to evaluate the effects of different brewing conditions on the fluoride content in tea extracts, indicating the higher brewing temperature and prolonged time could accelerate the release of fluoride in tea extracts. This study provides a quality control tool for tea consumers and manufacturers as well as contributes to enrich the applications of smartphone-based methods in the food sections, especially for Vietnam with the diversity of agricultural products.
{"title":"An optimized smartphone-based colorimetric detection method for evaluating the fluoride released in tea extracts from different brewing conditions","authors":"Le-Thi Anh-Dao, Do Minh-Huy, Nguyen Thu-Huong, Vo-Thi Tuong-Thu, Nguyen-Thi Kim-Sinh, Nguyen Thanh-Nho, Nguyen Cong-Hau","doi":"10.1007/s13738-024-03057-z","DOIUrl":"10.1007/s13738-024-03057-z","url":null,"abstract":"<p>A smartphone-based colorimetric detection method was optimized for measuring the fluoride content in tea extracts using zirconium-xylenol orange reagent. The images of the formed color complex in the presence of fluoride were captured and analyzed their color components through the RGB (Red, Green, Blue) vector values. To maintain the capturing conditions, a colorimetric box (150 × 70 × 90 mm) was self-designed by optimizing the smartphone camera-sample holder/cuvette distance and inside brightness. The calibration curve was constructed from 0.5 to 25 mg/L with the goodness of linearity (<i>R</i><sup>2</sup> > 0.995). Favorable repeatability and reproducibility were obtained (RSD<sub>r</sub> = 5.01% and RSD<sub>R</sub> = 5.02%), according to the Appendix F of AOAC (2016). UV–Vis and F ion-selective electrode were simultaneously conducted as reference methods for the developed smartphone-based method, demonstrating comparable fluoride content results in tea extracts obtained from these methods. Using 2.5 g tea brewed in 100 mL of deionized water at 90 °C for 60 min, a descending fluoride content order was achieved: black tea (3.31–3.85 mg/L) > oolong tea (2.38–2.65 mg/L) > green tea (2.25–2.97 mg/L) > white tea (2.28–2.31 mg/L). The smartphone-based method was also applied to evaluate the effects of different brewing conditions on the fluoride content in tea extracts, indicating the higher brewing temperature and prolonged time could accelerate the release of fluoride in tea extracts. This study provides a quality control tool for tea consumers and manufacturers as well as contributes to enrich the applications of smartphone-based methods in the food sections, especially for Vietnam with the diversity of agricultural products.</p>","PeriodicalId":676,"journal":{"name":"Journal of the Iranian Chemical Society","volume":"21 8","pages":"2137 - 2146"},"PeriodicalIF":2.2,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141348945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-09DOI: 10.1007/s13738-024-03055-1
Zhen Fan, Chunxia Li, Meijie Xu
ZnO/Ag nanocomposite was prepared via in situ method by using silver nitrate and ZnSO4 as the raw material. ZnO and ZnO/Ag were characterized by utilizing SEM, UV-vis, XRD, FTIR, and so on. The photocataytic degradation behaviors of ZnO and ZnO/Ag for trimethylamine (TEA) in air and solution were studied. The results indicated that ZnO/Ag had better photocatalytic degradation properties on trimethylamine under the condition of 0.06 g catalyst, 2 h photocatalytic time, and 15 A light intensity, and the degradation rates of TEA were up to 44 and 67% in air and solution, respectively. Furtherly, ZnO and ZnO/Ag also indicated perfect photocatalytic degradation properties toward to organic compounds in wastewater. Especially, the harmless treatment of triethylamine was achieved by using photocatalytic degradation method that provided a novel method for treating triethylamine. In all the above results leaded to a good application prospect of ZnO/Ag in the degradation of organic compounds in air and solution.
{"title":"Fabrication of ZnO/Ag photocatalyst and its photocatalytic degradation properties on trimethylamine","authors":"Zhen Fan, Chunxia Li, Meijie Xu","doi":"10.1007/s13738-024-03055-1","DOIUrl":"10.1007/s13738-024-03055-1","url":null,"abstract":"<div><p>ZnO/Ag nanocomposite was prepared via in situ method by using silver nitrate and ZnSO<sub>4</sub> as the raw material. ZnO and ZnO/Ag were characterized by utilizing SEM, UV-vis, XRD, FTIR, and so on. The photocataytic degradation behaviors of ZnO and ZnO/Ag for trimethylamine (TEA) in air and solution were studied. The results indicated that ZnO/Ag had better photocatalytic degradation properties on trimethylamine under the condition of 0.06 g catalyst, 2 h photocatalytic time, and 15 A light intensity, and the degradation rates of TEA were up to 44 and 67% in air and solution, respectively. Furtherly, ZnO and ZnO/Ag also indicated perfect photocatalytic degradation properties toward to organic compounds in wastewater. Especially, the harmless treatment of triethylamine was achieved by using photocatalytic degradation method that provided a novel method for treating triethylamine. In all the above results leaded to a good application prospect of ZnO/Ag in the degradation of organic compounds in air and solution.</p></div>","PeriodicalId":676,"journal":{"name":"Journal of the Iranian Chemical Society","volume":"21 8","pages":"2121 - 2126"},"PeriodicalIF":2.2,"publicationDate":"2024-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141367277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-05DOI: 10.1007/s13738-024-03044-4
Ali Reza Soleymani, Saeid Azimi, Azin Rahnama
This study investigates the combined effects of UV/TiO2 and UV/H2O2 processes on the degradation of 1,2-dichlorobenzene in aqueous media, employing a recycled current photo-reactor equipped with a water jacket. Evaluation of various factors—initial pH, TiO2 dosage, initial H2O2 concentration, pollutant concentration, and temperature—contributed to the optimization of degradation rates and operational costs for both processes. For the degradation of 50 mg/L of DCB, the optimal operating conditions were found to be for UV/TiO2: pH = 3, [TiO2] = 30 mg/L and T = 25 °C, and for UV/H2O2: pH = 3, [H2O2]0 = 350 mg/L and T = 25 °C. After 60 min of irradiation time, the degradation efficiency, pseudo first order rate constant and operational cost value for the UV/TiO2 and UV/H2O2 processes were as 98.9%, 0.0771 min−1, 11.6 $/m3 and 96.3%, 0.0573 min−1, 11.8 $/m3 respectively. Also, thermodynamic parameters of activation energy, enthalpy change, entropy change and standard Gibbs free energy were calculated as 21.78 (kJ/mol), 19.37 (kJ/mol), − 0.20 (kJ/mol K) and 73.34 (kJ/mol at 25 °C) for UV/TiO2 process and 7.62 (kJ/mol), 5.18 (kJ/mol), − 0.25 (kJ/mol K) and 80.14 (kJ/mol at 25 °C) for UV/H2O2 process. The investigation also encompassed the exploration of 13 hybridization scenarios, including UV/TiO2/H2O2 and UV/H2O2/TiO2, revealing notable findings. Notably, a specific hybridization scenario, namely UV/TiO2 (30 mg/L)/H2O2(250 mg/L), demonstrated a significant synergistic effect (29.5%). Evaluating pollutant mineralization unveiled compelling results, with approximately 85% mineralization achieved after 90 min for the UV/TiO2(30 mg/L)/H2O2(250 mg/L) scenario, showcasing a remarkable synergism (44%) in the mineralization process.